Let me start by saying that both of these services are great and I value the work they have done and continue to do. I would recommend either to someone looking for a hosted commenting system.
I had originally switched from Disqus to Intense Debate because ID imports comments from FriendFeed. Disqus has been talking about this feature for quite a while now, but it still doesn’t exist. I’m a FriendFeed fanatic. I need this type of integration. The FriendFeed comments plugin has been my main standby for this, but I crave an all-in-one solution.
ZOMG! Where are my comments?!
I was alerted by @nukirk on Twitter that all of my comments had disappeared from my post on the Blackbird browser. Now, as you can see, I do not have a huge blog. I do not get much traffic and I don’t really get many comments, so it was highly unacceptable for all of the comments to disappear from one of my most discussed posts. I tried frantically to restore my missing discussion. After resetting the Intense Debate plugin, disabling WP-SuperCache and everything else I could think of, I just ended up getting rid of Intense Debate entirely.